Special alphabet for messages sent by the telephotographic process



E.BEUN

S?ECIAL ALPHABET FOR MESSAGES SENT BY THE TELEPHOTOGRAPHIC PROCESS Filed March 5, 1922 Fig.1.

Patented duly 2 38, "i925,

EDOUARD BELIN, OF PARIS, FRANCE.

To all whom it may concern:

Be it known that I, EnoUAnD BELIN, a

citizen of the Republic of France, and resident of Paris, in the Republic of France, have invented certain new and useful Special Alphabet for Messages Sent by the Telephotographic Process, of which the following is a specification.

In the transmission of messages by wire or by radio-telegraphy in ordinary or in cipher language which is carried out by the exploration of any suitable geometric surface by means of a pointed member or like device, it is indispensable in order to obtain the maximum efficiency to provide for the use of a set of characters adapted to represent each letter or group of letters, in the same manner as employed in stenography by signs, but on the other hand this alphabet which may be called upon to be used for typewriting purposes, should correspond to requirements of an exactly defined nature.

1. The surfaces to be explored are to be covered by the greatest possible number of words but on condition that this shall not interfere with the proper reading messages. This will require the production of characters of an uniform height, without loops, thereby enabling the like spacing to be reduced to a minimum.

2. The forms, dimensions and spacing of the said characters are such as will enable the use of transmitting posts operating at the maximum speed of the electrical or like devices employed for sending purposes, as well as the maximum forward movement of the point when passing from one position to another. No parts of a character are to be used which are susceptible of moving between two spiral paths of the tracing point, and the apparatus shall not employ an interval nor a thickness which is below the minimum required for the operation of the electrical devices. In other words, the character of the alphabet should not contain elements the width of which is so small that they cannot be explored by the point when this point describes two consecutive spirals.

The characters will therefore be produced according to the following forms, which are the only ones compatible with .all the requirements, supposing the document disposed upon a cylinder with lines which are Application filed March 8, 1922. Serial No. 5%,905

formed perpendicular to the generatrices of the cylinder passed over by the point, that is, parallel to the path of the said point:

(at) Uniform height it greater than the pitch;

(6) The height 71. will depend upon the number of lateral elements;

(0) The thickness of the long branches of the body 6 is greater thanthe minimum at necessary for the operation of the electrical devices;

(cl) The height h of the lateral elements is greater than the pitch value;

(c) The spacesz' between the lateral elements and between two lines of characters are greater than the pitch value;

(7) The length Z of these lateral elements will be small by reason of their junction with the main body of the character;

If, for instance, the character is formed with a main body and three lateral elements on each side, Figure 1, the following may be used:

The character will thus occupy a rectangle having for dimensions 2% and 6p, and the movement of the point will produce the same in all its details, this movement tak ing place in the sense of the arrow. Should it be desired to make use of characters (Figure 2) based on the rectangular form with a maximum of two adjacent squares, the following may be employed:

hzgp h 41) The character will occupy a rectangle which may be represented by 6m and ip.

In this event the space between two letters will be equal to m and the line spacing will be equal to the pitch value.

It is obvious that the forms may be varied it is preferable to use the second value, since 2722- might be found too small, and so on for like circumstances.

The accompanying drawing shows various forms of these two examples, but it is obvious that these are not of a limitative character. It is also understood that the said characters may represent letters, combinations of letters, dipthongs or even words, and that they are to be employed irrespectively of the method of exploring the surface either by spiral movement, by slide 1notion or the like.

Having now particularly described and ascertained the nature of my said invention, and in what manner the saine is to be performed, I declare that what I claim is:

1. In an alphabet for the transmission of telegraphic messages, an exploring point located at the sending end, and symbolic characters in relief having a height exceeding in extent the space between the consecutive paths travelled by the said exploring point.

2. In an alphabet for the transmission of telegraphic messages, a spirally moving exploring point located at the sending end, and symbolic characters in relief comprisinga rectangular body provided with lateral elements spaced apart a distance greater than thespace between the spirals of the helix described by the said exploring point.

3. In an alphabet for the transmission of telegraphic messages, an exploring point located at the sending end, and symbolic characters in relief having a length exceeding in extent the space necessary for functioning of the electric devices actuated by the exploring point.

In witness whereof I have hereunto signed my name.

EDOUARD BELIN. 

